Miles between Rockville, MD and Dekalb, IL

There are
740 mi
from Rockville, MD to Dekalb, IL

That's the driving distance. It would take 13 hours 53 mins to go from Rockville, Maryland to Dekalb, Illinois.

The flight distance (direct flight from Rockville, MD to Dekalb, IL) is 639.59 mi.

740 mi = 1,191.10 kms